為了充分利用ARM內核強大的處理功能,應當使用快速的程序和數據存儲器。但是,靜態RAM足夠快,完全可以支持一個周期內最高速度的讀寫訪問,因此,Flash存儲器的速度顯著降低。
上傳時間: 2013-11-06
上傳用戶:獨孤求源
The LPC2292/2294 microcontrollers are based on a 16/32-bit ARM7TDMI-S CPU with real-time emulation and embedded trace support, together with 256 kB of embedded high-speed flash memory. A 128-bit wide memory interface and a unique accelerator architecture enable 32-bit code execution at the maximum clock rate. For critical code size applications, the alternative 16-bit Thumb mode reduces code by more than 30 pct with minimal performance penalty. With their 144-pin package, low power consumption, various 32-bit timers, 8-channel 10-bit ADC, 2/4 (LPC2294) advanced CAN channels, PWM channels and up to nine external interrupt pins these microcontrollers are particularly suitable for automotive and industrial control applications as well as medical systems and fault-tolerant maintenance buses. The number of available fast GPIOs ranges from 76 (with external memory) through 112 (single-chip). With a wide range of additional serial communications interfaces, they are also suited for communication gateways and protocol converters as well as many other general-purpose applications. Remark: Throughout the data sheet, the term LPC2292/2294 will apply to devices with and without the /00 or /01 suffix. The suffixes /00 and /01 will be used to differentiate from other devices only when necessary.
上傳時間: 2014-12-30
上傳用戶:aysyzxzm
The LPC1850/30/20/10 are ARM Cortex-M3 based microcontrollers for embeddedapplications. The ARM Cortex-M3 is a next generation core that offers systemenhancements such as low power consumption, enhanced debug features, and a highlevel of support block integration.The LPC1850/30/20/10 operate at CPU frequencies of up to 150 MHz. The ARMCortex-M3 CPU incorporates a 3-stage pipeline and uses a Harvard architecture withseparate local instruction and data buses as well as a third bus for peripherals. The ARMCortex-M3 CPU also includes an internal prefetch unit that supports speculativebranching.The LPC1850/30/20/10 include up to 200 kB of on-chip SRAM data memory, a quad SPIFlash Interface (SPIFI), a State Configuration Timer (SCT) subsystem, two High-speedUSB controllers, Ethernet, LCD, an external memory controller, and multiple digital andanalog peripherals.
上傳時間: 2014-12-31
上傳用戶:zhuoying119
NAND FLASH 讀寫控制以及ECC的VHDL源程序
上傳時間: 2013-10-13
上傳用戶:003030
Adobe Flash Player Plugin_11.2\游戲、農場、視頻
上傳時間: 2014-01-17
上傳用戶:會稽劍客
Adobe Flash Player Plugin_11.2\游戲、農場、視頻
上傳時間: 2013-11-05
上傳用戶:199311
This application note describes how to retrieve user-defined data from Xilinx configurationPROMs (XC18V00 and Platform Flash devices) after the same PROM has configured theFPGA. The method to add user-defined data to the configuration PROM file is also discussed.The reference design described in this application note can be used in any of the followingXilinx FPGA architectures: Spartan™-II, Spartan-IIE, Spartan-3, Virtex™, Virtex-E, Virtex-II,and Virtex-II Pro.
上傳時間: 2013-10-09
上傳用戶:guojin_0704
一些應用利用 Xilinx FPGA 在每次啟動時可改變配置的能力,根據所需來改變 FPGA 的功能。Xilinx Platform Flash XCFxxP PROM 的設計修訂 (Design Revisioning) 功能,允許用戶在單個PROM 中將多種配置存儲為不同的修訂版本,從而簡化了 FPGA 配置更改。在 FPGA 內部加入少量的邏輯,用戶就能在 PROM 中存儲的多達四個不同的修訂版本之間進行動態切換。多重啟動或從多個設計修訂進行動態重新配置的能力,與 Spartan™-3E FPGA 和第三方并行 flashPROM 一起使用時所提供的 MultiBoot 選項相似。本應用指南將進一步說明 Platform Flash PROM 如何提供附加選項來增強配置失敗時的安全性,以及如何減少引腳數量和板面積。此外,Platform Flash PROM 還為用戶提供其他優勢:iMPACT 編程支持、單一供應商解決方案、低成本板設計和更快速的配置加載。本應用指南還詳細地介紹了一個包含 VHDL 源代碼的參考設計。
上傳時間: 2013-10-10
上傳用戶:wangcehnglin
本應用指南講述一種實用的 MicroBlaze™ 系統,用于在非易失性 Platform Flash PROM 中存儲軟件代碼、用戶數據和配置數據,以簡化系統設計和降低成本。另外,本應用指南還介紹一種可移植的硬件設計、一個軟件設計以及在實現流程中使用的其他腳本實用工具。 簡介許多 FPGA 設計都集成了使用 MicroBlaze 和 PowerPC™ 處理器的軟件嵌入式系統,這些設計同時使用外部易失性存儲器來執行軟件代碼。使用易失性存儲器的系統還必須包含一個非易失性器件,用來在斷電期間存儲軟件代碼。大多數 FPGA 系統都在電路板上使用 Platform FlashPROM (在本文中稱作 PROM),用于在上電時加載 FPGA 配置數據。另外,許多應用還可能使用其他非易失性器件(如 SPI Flash、Parallel Flash 或 PIC)來保存 MAC 地址等少量用戶數據,因此導致系統電路板上存在大量非易失性器件。
標簽: MicroBlaze Platform Flash XAPP
上傳時間: 2013-10-15
上傳用戶:rocwangdp
三菱PLC的學習FLASH
上傳時間: 2013-12-29
上傳用戶:leyesome